...:::2013 Official RX8 Spring Kick-Off Meet:::...
05-28-2013, 10:14 AM
#177
Bump
Well Ladies and Gentleman ...
I wanted the bump this thread to see if any of you had gone to Mazda for a compression test.
Beouf just PM'd me about his results, I think many of you will find it interesting and to your relief.
Beouf's results:
kgf/cm2
front rotor
7.1, 7.8, 7.4
rear rotor
8.3, 8.0, 8.3
those numbers converted to psi are:
front rotor
101, 111, 105
rear rotor
118, 114, 118
the corrected numbers your tester gave were:
front rotor
96, 94, 102
rear rotor
105, 106, 102
So clearly the results from Mazda are higher.
However there does seem to be some correlation in that the TR01-v2 measured the front overall being lower than the rear, same as Mazda.
The questions for me are:
1) Does the device read low naturally or sensor damage?
2) Is the RX8 Compression Application reporting the correct normalized value?
3) Is there something wrong with my Math or did I miss/use an incorrect correction factor
4) The test method.
So in short I would say, my results are low but if you still suspect low compression and you can afford it, there is no harm in getting a compression done at Mazda.
It provides a good idea of your engine health.
And please let me know your results.
Thanks
Scott
Well Ladies and Gentleman ...
I wanted the bump this thread to see if any of you had gone to Mazda for a compression test.
Beouf just PM'd me about his results, I think many of you will find it interesting and to your relief.
Beouf's results:
kgf/cm2
front rotor
7.1, 7.8, 7.4
rear rotor
8.3, 8.0, 8.3
those numbers converted to psi are:
front rotor
101, 111, 105
rear rotor
118, 114, 118
the corrected numbers your tester gave were:
front rotor
96, 94, 102
rear rotor
105, 106, 102
So clearly the results from Mazda are higher.
However there does seem to be some correlation in that the TR01-v2 measured the front overall being lower than the rear, same as Mazda.
The questions for me are:
1) Does the device read low naturally or sensor damage?
2) Is the RX8 Compression Application reporting the correct normalized value?
3) Is there something wrong with my Math or did I miss/use an incorrect correction factor
4) The test method.
So in short I would say, my results are low but if you still suspect low compression and you can afford it, there is no harm in getting a compression done at Mazda.
It provides a good idea of your engine health.
And please let me know your results.
Thanks
Scott
Here are the numbers from the printout they provided me.
R1 - 8.4, 8.4, 7.9 (119, 119, 112 psi) @ 299rpm
R2 - 9, 9.3, 9.3 (128, 132, 132 psi) @ 301rpm
I know those aren't normalized to 250 rpm but if you do normalize them I believe my front rotor is still just a pass. The tech showed me on their system that he punches the numbers in that he gets from the tester with the rpm he cranked at and the system calculates and determines if it's a pass or a fail.
05-30-2013, 10:02 AM
#178
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There's an "RX8 Compression Calculator" for the iphone/pod/pad plateform this converts compression test numbers ( psi/KPA/kgf) to 250 rpm, notes the difference, insicates failure and records history in a database. I plugged the numbers listed above and it said it was a pass. If this APP is accurate, it would seem to be a handy tool.
06-01-2013, 05:45 PM
#181
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